Under the Carbon Emissions Reduction Target (CERT) energy companies are obliged to help households in Wales reduce their use of electricity and gas to lower their carbon emissions.

Suppliers are required to concentrate at least 40% of their activity on vulnerable and low-income households, such as people over 70.

In Cardiff Central 5,111 households have benefited from wall or loft insulation with 29,000 people benefiting across Cardiff as a whole.

Commenting, Jenny said:

"These figures show that going green can save people money. Thanks to this duty on energy companies to insulate houses without cost to the homeowner, many households will have lower bills and can keep their houses warmer.

"From this autumn, Liberal Democrats have ensured the Green Deal will continue this work. The Green Deal will mean every home and business in Cardiff is properly insulated over the coming years.

"With the Green Deal, the Coalition Government is doing the right thing for the environment, household budgets and the economy. Not only does this mean lower energy bills for everyone but this huge investment will create green jobs and investment which leave a lasting legacy."